Those are very beautiful cats!
You can feed canned kitten food. Kittens are so active they usually have big appetites. Feed according to directions on the can, and you can adjust it if the kitten seems hungry all the time.
You can feed adult canned food when he's older.
Don't use clumping litter with a kitten this age, but use plain clay litter.
Is this your only pet? If so, and if no one is home during the day, the kitten will be desperately lonely.
If no have no other cats, you might want to seriously consider adopting another kitten from a shelter or rescue. Your kitten would love this!!